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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0b09bbe937be3f6c448ea26197173da605a01ec47e04b08512b7423bb8b178' 
  AND token = 'iwsXE+dmK5ifhcZ3nCJxOkhQNKDrWg+rhzTm3tw4Z9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}